Octamethylcyclotetrasiloxane
- Createtime： 2026-04-14
- Updatetime： 2026-09-30
Product Details
| useage |
Industrial use
|
| deliveryInfo |
|
| appearance |
liquid
|
| Molecular Weight |
296.62
|
| aliasen |
|
| supplyCapacity |
50000MT/Month
|
| harbor |
Qingdao,China
|
| minorder |
1KG
|
| Appearance |
Colorless transparent volatile liquid
|
Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
Basic Information
Product Name: Octamethylcyclotetrasiloxane
CAS Number: 556-67-2
Alias: D4, Cyclotetrasiloxane octamethyl
Chemical Full Name: Octamethyl-1,3,5,7-tetracyclotetrasiloxane
Molecular Formula: C8H24O4Si4
Molecular Weight: 296.62
EINECS: 209-136-7
Structural Information
- Structure Type: Cyclic organosiloxane (4-membered siloxane ring)
- Structural Features: Four Si-O bonds form a stable eight-membered ring, each silicon atom bonded with two methyl groups; low surface tension, good volatility, excellent compatibility with silicone polymers
- Characteristic: Low viscosity volatile cyclic silicone monomer
Physical & Chemical Properties
- Appearance: Colorless transparent low-viscosity liquid
- Odor: Faint slight silicone odor
- Melting Point: 17–18 °C
- Boiling Point: 175–176 °C
- Flash Point: 63 °C (closed cup)
- Density (20℃): 0.956 g/cm3
- Refractive Index (20℃): 1.396
- Solubility: Insoluble in water; miscible with ethanol, isopropanol, mineral oil, aromatic solvents, silicone oils
- Stability: Stable at room temperature sealed storage; hydrolyzes under strong acid/strong alkali to form linear silanols; polymerizes under catalyst to generate polydimethylsiloxane; inert to most non-polar raw materials
Synthesis & Applications
Production Method
Dimethyldichlorosilane undergoes hydrolysis and cyclization reaction, then rectification separation to obtain high-purity D4.
Main Applications
- Silicone polymer monomer: Raw material for polymerization of dimethyl silicone oil, silicone rubber, silicone resin
- Cosmetic raw material: Volatile carrier for skin care cream, hair care essence, makeup base, quick dry without greasy residue
- Daily chemical auxiliary: Lubricant and smoothing agent for shampoo, body wash
- Industrial additive: Release agent, lubricant for plastic, rubber, textile softener
- Electronic chemical auxiliary: Low-viscosity cleaning solvent for precision components
Safety & Storage Instructions
GHS Hazard Classification
- H226 Flammable liquid and vapor
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Personal Protection
Organic vapor respirator, chemical splash goggles, oil-resistant nitrile gloves; operate in ventilated workshop, far away from open flame and static electricity.
Storage Condition
Hermetically sealed iron drum, cool dry ventilated warehouse below 30℃; isolate oxidants, strong acid and alkali.
Transportation
Class 3 weakly flammable organic liquid; avoid sunlight exposure and high temperature during transit.
Quality Specifications
- Purity (GC): ≥99.5%
- Moisture: ≤0.01%
- Chroma (Pt-Co): ≤10
- Total volatile impurities: ≤0.5%
Information Summary Table
| Item | Specification |
| CAS Number | 556-67-2 |
| Product Name | Octamethylcyclotetrasiloxane (D4) |
| Synonym | D4, Octamethyl cyclotetrasiloxane |
| Molecular Formula | C8H24O4Si4 |
| Molecular Weight | 296.62 |
| Appearance | Colorless transparent volatile liquid |
| Flash Point | 63℃ |
| Core Advantage | Volatile, low greasy, basic silicone monomer |
| Storage Rule | Sealed cool ventilated storage, away from fire source |
| Hazard Property | Weakly flammable liquid, mild skin/eye irritant |
| Main Usage | Silicone polymerization monomer, cosmetic volatile raw material, textile softener |
